Heat exchanger



Jan. 25, 1944.

L. H. MORRIS 2,340,138 HEAT EXCHANGER lFiled Deo. 31, 1941 Ill/4 l 2ATTOR Patented Jan. 25, 1944 HEAT EXCHANGER Layne H. Morris, Honesdale,Pa., assignor to The Lummus Company, New York, N. Y.. a corporation ofDelaware Application December 31. 1941, Serial No. 425,041

5 Claims.

This invention relates to improvements in heat exchangers of the shelland tube type and particularly to an improved internal baille construc'tion therefor.

The heat exchange eiliciency of a shell and tubel type heat exchangercan be substantially improved by providing more nearly truecountercurrent iiow between the iluid outside of the tubes and the iluidinside of the tubes and by preventing the undesired bypassing or leakageof the liquid around the baille in order that high velocities can beobtained. It has been customary to use longitudinally extendingtransverse bailles to subdivide the tube bundle into groups of tubes sothat the desired ilow of iluid can be accomplished. The problem ofsealing the baille within the shell to prevent bypassing of the externalfluid between its inlet and outlet presents considerable diillculty,however, and the many forms of mechanical expanding devices proposed toprovide an eil'ective seal between the edge of the baule and the shellwall have proved to be very complicated and diillcult to adjust becauseof the relatively great length and the relatively small diameter of thecustomary heat exchanger shell. On the other hand, internal welding ofthe baille to the shell wall is limited to shells of relatively largediameter or relatively short length.

It is an object of my invention to provide a simplled internal bailleconstruction for a vessel such as a shell and tube type heat exchanger.

Another object of my invention is to provide a shell and tube type heatexchanger with a longitudinal baille which extends entirely across theshell and through the wall thereof and which ls sealed thereto as bywelding from the exterior of the shell. The welding operation is therebymore easily accomplished, and the resulting weld is subject to a morethorough inspection.

It is a particular object of my invention to provide a, shell and tubetype heat exchanger having a bifurcated tube bundle and a longitudinalbaille extending between the two tube groups oi' the tube bundle andbeing integrally secured to the tube sheets, such baille beingexternally secured to the shell, whereby a simplified, improvedconstruction ls obtained.

A still further object of my invention is to provide an improved methodof welding or otherwise securing a longitudinal baille in the shell of ashell and tube type heat exchanger wherein the baille is first welded tothe tube sheets to assure adequate strength and to provide adequateinspection, and thereafter semi-cylindrical shell sections are weldedboth to the tube sheets and to the baille to complete the unit.

Further objects and advantages of my invention will appear from thefollowing description of a preferred form oi embodiment thereof taken inconnection with the attached drawing illustrative thereof, in which:

Fig. 1 is an elongated view, with parts in section and parts brokenaway, taken along the line I--I of Fig. 2 and showing one form ofembodiment of my improved heat exchanger construction;

Flg. 2 is a vertical sectional view taken substantially along the line 22 of Fig. 1;

Fig. 3 is a horizontal sectional view taken substantially along the line3--3 of Fig. 2.

The heat exchanger generally shown in the drawing includes a shell, inwhich is mounted a tube bundle. This shell is preferably a cylindricalmember although my invention is equally applicable to heat exchangershells of other shapes. In the form of embodiment shown, the tube bundleis biiurcated and consists of two groups o1' tubes generally indicatedat |2a and I2b. These two groups of tubes are secured at their ends tothe tube sheets i3 and i4. The tube sheet i4 is provided with the tubesheet cover i6, which is secured thereto in any manner well known to theart, and the other tube sheet i3 is suitably secured to the flanges ofchannel i8.

Channel lil is provided with inlet and outlet nozzles I9 and 2U, bymeans of which a fluid may be circulated through the tubes of the tubebundle. The shell is similarly provided with inlet and outlet nozzles 22and 23 so that a second fluid can be passed over the outside surface ofthe i tubes in heat exchange relation with the iirst iluid in a mannerwell known to the art. If desired, independent uids may be circulated oneach side of the baille 25 by using the additional nozzles 22a and 23a.

My particular invention relates more specifically to the provision of asimplified longitudinal baille, generally indicated at 25, and themanner in which such a baille is secured to the shell. A baille of thistype is required if countercurrent flow or high velocity ilow oi' theheat exchanging fluids is desired; but its construction must be such asto prevent the external iluid fromA bypassing. It is my particulardesire to provide a construction that assures a tight Joint between theedges of the baille and the wall of the shell,

. yet is simple to construct. will require no maintenance, and ispermanently tight.

In accordance with my invention, I rst weld the end edges of the baille2l to the respective tube sheets I3 and I4 along the lines Isa and Ila.Such welds can be completely inspected at the time they are made, andthereafter will be permanently tight. Such welding ilxes the size of thetube bundle.

As a second operation, I preferably attach substantiallysemi-cylindrical shell members Illa and I b to the longitudinal edges ofthe baille 25 and to the peripheral edges of thev tube sheets i3 andil.v The longitudlnal'welds are indicated at Illc and thecircumferential welds at Illd. Each of these joints can be made from theoutside with the desired penetration, and the shell becomes completewith a fully welded interior.

The resulting shell construction comprises a unit that is structurallystronger than one provided with the customary internal baffle, and it isconsiderably simpler and more economical to fabricate. Bypassing of theexternal iluid is completely avoided, although, if desired, a transverseflow can be provided by a suitable aperture in the baille and theelimination of nozzles 23 and 23a.

It will be appreciated that more than one baille may be inserted into asingle heat exchanger shell in accordance with my invention. When aplurality of bailles is desired, one may be placed on a diameter of theshell and the others on chords thereof, or all may be placed on chordsof the shell. Generally, any desired division of the tube bundle intogroups is possible, and one or more ballles may be fixed in position inaccord with the tube arrangement selected. Preferably, the baille orbaiiies are arranged in planes at right angles to the axes of nozzles-22 and 23.

While I have shown and described a. preferred form of embodiment of myinvention, I am aware that modifications may be made thereto; and I,therefore, desire a broad interpretation of my invention within thescope and spirit of the description herein and of the claims appendedhereinafter.

I claim:

1. A heat exchanger of the shell and tube type comprising a tube bundleincluding tube sheets spaced along the tubes, a channel member at theouter face of each of said tube sheets, a longitudinal baille platelbetween said sheets and dividing the tubes of the bundle into groups andwelded continuously along its opposite end edges to the inner faces ofthe respective tube sheets, and a-straight tubular shell formed oftransversely opposed approximately semi-cylindrical sections at theopposite faces of the lbaille plate, with -the longitudinal edges of theplate between the longitudinal edges of the different shell sections andwith said shell edges welded continuously therealong to the margins ofsaid longitudinal edges of the baille plate from tube sheet to tubesheet and with the opposite end edges of the shell sections weldedcontinuously therearound to the inner faces of the tube sheetsrespectively, said welding of the baille plate along its longitudinaledges and its end edges forming a continuous seal for the plate entirelyaround the plate contour, the longitudinal edges of the plate beingsubstantially flush with the periphery of the shell, and the tube sheetsbeing larger than said periphery to provide them with proiecting marginsfor attachment of said channel members thereto.

2. A heat exchanger of the shell and tube type comprising a tube bundleincluding tube sheets spaced along the tube. a channel member at theouter face of each of said tube sheets, a longitudinal baille platebetween said sheets and dividing the tubes of the bundle into groups andwelded continuously along its opposite end edges to the inner faces ofthe respective tube sheets, and a straight tubular shell formed oftransversely opposed longitudinal sections at the opposite faces of thebaille plate, with the longitudinal edges of the latter betweenlongitudinal edges of the different shell sections and with said shelledges welded continuously therealong to the margins of said longitudinaledges of the baille plate from tube sheet to tube sheet and with theopposite end edges of the shell sections welded continuously therearoundto the inner faces of the tube sheets respectively, said welding of thebaille plate along its longitudinal edges and its end edges forming acontinuous seal for the plate entirely around the plate contour, and thetube sheets being larger than the periphery of the shell to provide themwith projecting margins for attachment of said channel members thereto.

3. A heat exchanger of the shell and tube type comprising a tube bundleincluding a tube sheet, a channel member at the outer face of said tubesheet, a longitudinal baille plate dividing the tubes of said bundleinto groups and welded continuously along one of its end edges to theinner face of said tube sheet, and a straight tubular shell formed oftransversely opposed approximately semi-cylindrical sections at theopposite faces of the baille plate, with the longitudinal edges of thelatter between the longitudinal edges of the diierent shell sections andwith said shell edges welded continuously therealong to the margins ofsaid longltduinal edges of the baille plate, and with the edges of saidsections at one end of the shell welded continuously therearound to theinner face of said tube sheet, said welding of the bailleplate along itslongitudinal edges and along said end edge thereof forming a continuousseal, the longitudinal edges of the baille plate being substantiallyilush with the periphery of the shell, and the tube sheet being largerthan said periphery to provide the sheet with said prolecting margin forattachment of a channel member thereto.

4. A heat exchanger of the shell and tube type comprising a tube bundleincluding tube sheets spaced along the tubes, a channel member at theouter face of each of said tube sheet, a solid longitudinal baille platebetween said sheets and dividing the tubes of the bundle into groups,welds -extending continuously along the opposite end edges of said plate.and securing and sealing said edges to the respective tube sheets, astraight tubular'shell formed of transversely opposed approximatelysemi-cylindrical sections at the opposite faces of said plate and eachhaving a fluid inlet nozzle and a fluid outlet nozzle, the longitudinaledges of said plate extending between the opposed longitudinal edges ofthe different shell sections, penetration welds extending continuouslyalong the full length of said shell edges and substantially the fullthickness of said edges and securing and sealing them to said plate,said welds along the longitudinal edges and the end 4 edges of the plateforming a continuous seal between the plate and the shell sections andthe plate and the tube sheets, and said seal extending entirely aroundthe plate contour, and welds securing and sealing the end edges of theshell sections to the inner faces of the tube sheets entirely around theperiphery of the shell, the tube sheets being larger than said peripheryto provide them with projecting margins for attachment of said channelmembers thereto.

5. A heat exchanger of the shell and tube type comprising a tube bundleincluding a tube sheet, a channel member at the outer face of said tubesheet, a longitudinal baifle plate extending longitudinally into saidbundle between tubes thereof and welded continuously along one of itsend edges to the inner face of said tube sheet, a straight tubular shellformed of a pair of transversely opposed longitudinal sections at theopposite faces of the baille plate, with the longitudinal edge marginsof the latter between the lonfgitudinal edges of said opposed shellsections,

CERTIFICATE OF CORRECTION.

Patent No. 2,510,158.

LAYNE H. MORRIS.,

lfzlffitli mi penetration welds extending substantially the fullthickness of said shell sections and extending continuously along saidedge margins of the baille plate and securing and sealing said edges ofthe shell sections to said plate margins at both faces of the plate,said welds along the longitudinal edges of the plate forming a,continuous seal with the welding along said end edge of the plate, andwelding securing and sealing the edges of said sections at one end ofthe shell continuously therearound to the inner face of said tube sheet,the tube sheet being larger than the periphery of the shell to providethe sheet with a. projecting margin for attachment of said channelmember thereto.

LAYNE H. MORRIS.

January 25 .v 19h-ll" It is hereby certified that error appears in theprinted specification of the above numbered patent requiring correctionas follows: Page l,

0nd column, line 8, for the word "elongated" read -elevational; page 2,

second column, line l, claim 2, for "tube" read -tubes; line u?, claimthat the said Le that the same may conform to the record of the case inthe Patent line )48, same claim, for "a channel" line 55, Claim 5, for'sheet" read sheets; and tters Patent should be read with thiscorrection therein Office.

signed and sealed this 18th day of April, A. D. 19ml.

(Seal) Leslie Frazer Acting Commissioner of Patents.

sections to the inner faces of the tube sheets entirely around theperiphery of the shell, the tube sheets being larger than said peripheryto provide them with projecting margins for attachment of said channelmembers thereto.

5. A heat exchanger of the shell and tube type comprising a tube bundleincluding a tube sheet, a channel member at the outer face of said tubesheet, a longitudinal baifle plate extending longitudinally into saidbundle between tubes thereof and welded continuously along one of itsend edges to the inner face of said tube sheet, a straight tubular shellformed of a pair of transversely opposed longitudinal sections at theopposite faces of the baille plate, with the longitudinal edge marginsof the latter between the lonfgitudinal edges of said opposed shellsections,

CERTIFICATE OF CORRECTION.

Patent No. 2,510,158.

LAYNE H. MORRIS.,

lfzlffitli mi penetration welds extending substantially the fullthickness of said shell sections and extending continuously along saidedge margins of the baille plate and securing and sealing said edges ofthe shell sections to said plate margins at both faces of the plate,said welds along the longitudinal edges of the plate forming a,continuous seal with the welding along said end edge of the plate, andwelding securing and sealing the edges of said sections at one end ofthe shell continuously therearound to the inner face of said tube sheet,the tube sheet being larger than the periphery of the shell to providethe sheet with a. projecting margin for attachment of said channelmember thereto.

LAYNE H. MORRIS.

January 25 .v 19h-ll" It is hereby certified that error appears in theprinted specification of the above numbered patent requiring correctionas follows: Page l,

0nd column, line 8, for the word "elongated" read -elevational; page 2,

second column, line l, claim 2, for "tube" read -tubes; line u?, claimthat the said Le that the same may conform to the record of the case inthe Patent line )48, same claim, for "a channel" line 55, Claim 5, for'sheet" read sheets; and tters Patent should be read with thiscorrection therein Office.

signed and sealed this 18th day of April, A. D. 19ml.

(Seal) Leslie Frazer Acting Commissioner of Patents.

